blood test 6/7 dpo

i had a blood test done around 6-7 dpo and it came back negative. i’ve read in a lot of places that 7 dpo is too early to test, but i’ve also read that it’s fine. it’s only been 13 days since we tried, so is there a chance the blood test could’ve produced a false negative, and that i could have actually conceived and it just won’t show up yet? thanks!!